Hi, in our 29 gallon aquarium, we have 2 Harlequin Rasboras among other fish. Originally we bought 6, but it was a bad batch. So one of the harlequins is always just staying in the top area not really swimming. I assume this is because he wants to be in a larger school. Unfortunately our water is around 82 degrees, now that I know that is not the ideal temperature, I am not sure that that would be such a good idea to add 4-6 more. We have a 29 gallon long we could move the harlequins too, but I am concerned that the one that always stays still would not transition very well. Btw our ph is around 8.